USB2+umass: root mount fails

[Andrew Thompson]

On Mon, Feb 16, 2009 at 01:53:36PM -0800, Marcel Moolenaar wrote:
> It appears that the root mount isn't serialized with USB discovery
> in the same way it was under USB1.

It seems that this is not completly resolved with the root mount hold in
r188907 as geom may not have tasted the partition tables when
vfs_rootmount is woken. USB still needs to finish its bus probe earlier
on the boot process.

Andrew